It allows players to have a currency (I guess you would also have to have iConomy if you didn't have it already) and be able to buy things from other players! My old server that I played on had a Shopping Complex in which players could create their own shops and sell items to other players! Also I think the way the mod displays the item is actually pretty cool

It's a fairly simple mod and only took a little while for me to get used to it! I hope you consider this mod because it is really great but if you don't, I understand also.